CN103114186A - Control cooling method of easy-welding high-performance steel plate - Google Patents
Control cooling method of easy-welding high-performance steel plate Download PDFInfo
- Publication number
- CN103114186A CN103114186A CN2013100831689A CN201310083168A CN103114186A CN 103114186 A CN103114186 A CN 103114186A CN 2013100831689 A CN2013100831689 A CN 2013100831689A CN 201310083168 A CN201310083168 A CN 201310083168A CN 103114186 A CN103114186 A CN 103114186A
- Authority
- CN
- China
- Prior art keywords
- steel plate
- cooling
- temperature
- low
- welding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention provides a technical scheme of a control cooling method of an easy-welding high-performance steel plate. The easy-welding high-performance steel plate comprises the following chemical components in percentage by weight: 0.05-0.09% of C, 0.1-0.25% of Si, 1.55-1.65% of Mn, 0.025-0.035% of Nb, 0.025-0.035% of V, 0.20-0.30% of Cr, 0.0008-0.0025% of B, 0.020-0.045% of Alt, 0.015-0.030% of Ti and billet of which the low-welding crack sensitivity index Pcm is less than 0.21%; a final steel plate with the thickness of 12-60mm is rolled in a non-recrystallization area, and the effects of dislocations strengthening, precipitation strengthening and phase change strengthening in cooling after rolling are sufficiently realized by adopting different online cooling modes according to different performance requirements of the final steel plate; and the microstructure is controlled according to different performance requirements to obtain a proper complex-phase structure. According to the scheme, flexible control on performance is realized through the flexibility of the cooling technology by use of one component; the produced steel plate has uniform structure, low yield ratio, high plasticity and excellent low-temperature toughness; the steel plate does not need preheating before welding and heat treatment after welding; and the individualized needs of users are met by the flexibility of the production line.
Description
Technical field
What the present invention relates to is the technical field of the production method of quality plate, especially has the control method of cooling of the easy welding quality plate of the difference in functionality indexs such as height is tough, low yield strength ratio, high-elongation.
Background technology
High-performance steel is compared with traditional soft steel not only has higher intensity, and has better low-temperature flexibility, weldability and cold formability etc.its Composition Design is on the basis of economic Clean Steel, with economical element nb, V, Ti, the alternative Mo such as B, the minimizing optimization design of the precious alloys such as Ni, in conjunction with advanced TMCP technology, by accurate control cooling path to control phase transition process, fully excavate the highly malleablized ability of thin crystalline substance and heterogeneous structure structure, realize high solderability, the batch supply of high strength steel, especially added low yield strength ratio, the its functional attributes such as high-elongation, comply with modern project machinery, coal mine machinery, the antagonism such as special car fatigure failure, the safety such as cold roll forming, the requirement of energy-conserving and environment-protective aspect.
But the addition of steel mill's precious alloy in the high-performance steel actual production process is generally higher both at home and abroad at present, when producing the above easily welding of 600MPa rank high-performance steel, must add the precious alloys such as certain Cr, Mo, Ni, Cu.the application number of being applied for by a disclosed Jiangsu company limited of Sha Gang iron and steel research institute of State Intellectual Property Office is 201010295925.5, the patent of " high-strength low-crack sensitive slab and manufacture method thereof " by name, this patent provides a kind of manufacture method that adopts the yield strength 420MPa steel grade of controlled rolling+cooling control technology production, its weak point is that the armor plate strength rank of producing is low, its speed of cooling, final cooling temperature subject range is narrow (9-12 ℃/s, 470-580 ℃), be difficult to realize that the steel billet with a kind of composition realizes the Flexible Production of multifunctional performance index by the adjustment of subsequent technique, especially in steel, the cold temperature of opening of soft or hard phase volume per-cent does not have to control on affecting, do not realize the production of low yield strength ratio steel, contain precious alloy element Cu, Ni in the composition of steel, easily cause strand and steel plate crackle in actual production process, its Composition Design or the main strengthening effect that relies on alloying element embody the cooling effect realizing aspect performance flexibility target of controlling.
Application number by the application of a disclosed Baoshan Iron ﹠ Steel Co., Ltd of State Intellectual Property Office is 200410084699.0, the patent of " a kind of low yield strength ratio easy welding structure steel thick plate and production method thereof " by name, its weak point is that this patent has adopted the Ni content up to 0.30-0.32%, and Si content reaches 1-1.5%, the Composition Design system has obviously different from this patent, high Si content can make the welding crack sensibility coefficient high simultaneously, the weldability variation.In addition, it has realized the low yield strength ratio index by the control to cooling stages, as for for guarantee the high-ductility plasticity index how to control out cold, end is cold, the cooling rate cooling parameter is not mentioned.
Can find out from above-mentioned two technical schemes, mostly in the prior art is to have added too much alloying element, this has not only improved cost, there is no to improve the quality of steel yet, ignored again in modern TMCP technology simultaneously, the rolling stock accelerated cooling process can play the effect of controlling steel performance, and this is the existing deficiency of prior art.
Summary of the invention
Technical problem to be solved by this invention, be exactly for the existing deficiency of prior art, and a kind of technical scheme of control method of cooling of easy welding quality plate is provided, by the minimizing design of alloy element, greatly reduce cost of alloy, reduced the welding crack sensibility coefficient; Control by cooling mode, performance phase transformation highly malleablized maximum capacity, guarantee structure refinement and heterogeneous reinforced with process means, produce finished product thickness and be 12-60mm, tensile strength greater than the low-welding crack-sensitive High Strength Steel Plate with height tough or low yield strength ratio or high-elongation difference in functionality index of 700MPa.
this programme is achieved by the following technical measures: a kind of control method of cooling of easy welding quality plate, its chemical composition content per-cent by weight is C 0.05-0.09%, Si 0.1-0.25%, Mn 1.55-1.65%, Nb 0.025-0.035%, V 0.025-0.035%, Cr 0.20-0.30%, B 0.0008-0.0025%, Alt 0.020-0.045%, Ti 0.015-0.030%, all the other are iron and inevitable impurity, welding crack sensibility indices P cm value is less than 0.21% steel billet, the district is rolled into the steel plate that final thickness is 12-60mm at non-recrystallization, take the on-line cooling pattern to obtain the steel plate of required mechanical property to described steel plate.
The steel plate cooling mode of applicable high tough index request is, the temperature of steel plate after controlled rolling being carried out water-cooled is controlled at 800-760 ℃, and once is cooled to 500-550 ℃ with the speed of cooling of 15-20 ℃/s, and then air cooling is to room temperature; What obtain is organized as granular bainite and a part of ferrite bainite, and plate property satisfies yield strength greater than 600MPa, and tensile strength is greater than 700MPa, and unit elongation is greater than 16%, and-40 ℃ of low-temperature impacts are greater than the high strength steel plate of the mechanical property requirements of 200J.
The steel plate cooling mode of applicable low yield strength ratio index request is, after controlled rolling, steel plate is treated coldly temperature in the rollgang overhead, and the water-cooling system that enters fast during to 700-650 ℃ to be cooled is cooled to 400-450 ℃ with the cooling rate of 18-28 ℃/s, and then air cooling is to room temperature; Polygonal ferrite+the granular bainite that is organized as 40-45% that obtains+a large amount of ferrite bainite, plate property satisfies yield tensile ratio less than 0.8, yield strength is greater than 530MPa, tensile strength is greater than 700MPa, unit elongation is greater than 16%, and-40 ℃ of low-temperature impacts are greater than the low yield strength ratio steel plate of the mechanical property requirements of 120J.
The steel plate cooling mode of applicable high-elongation index request is, after controlled rolling, steel plate enters the water-cooled zone fast, opens cold temperature and is controlled at greater than 850 ℃, then direct quenching is cooling, cooling termination temperature is 300-400 ℃, and tempering temperature is 520-600 ℃, tempering time 1.5-2min/mm+10min; What obtain is organized as tempering bainite, and plate property satisfies unit elongation greater than 20%, and yield strength is greater than 650MPa, and tensile strength is greater than 700MPa, and-40 ℃ of low-temperature impacts are greater than the high-elongation steel plate of the mechanical property requirements of 150J.
In sum, this programme adopts the minimizing Composition Design, substitute valuable alloy as main principle take the economy alloying element, take full advantage of the most cheap alloy " water ", reduce alloy addition, strengthen the control split cold temperature, speed of cooling and cooling termination temperature, give full play to rear dislocations strengthening, precipitation strength, the effect of phase transformation strengthening when cooling of rolling.Require microtexture is controlled according to different performance, obtain suitable heterogeneous structure, the steel grade of production has that homogeneous microstructure, yield tensile ratio are low, the characteristics of plasticity high and low temperature tenacity excellent.
the armor plate strength that utilizes this programme to produce is high, mould, good toughness, yield tensile ratio is low, having realized need not preheating before weldering, postwelding need not thermal treatment, the quality plate thickness specification of producing is 12～60mm, the tensile strength of steel reaches the above level of 700MPa, more than-40 ℃ of low-temperature impact toughness reach 120J, the present invention is with low cost, the welding crack sensibility index is low, the Plate Welding performance is good, utilize a kind of steel of composition, can realize producing the Flexible Production of several functions product, actively utilize modern TMCP technology, the product performance that cooling production line can be realized have been widened, can satisfy growing engineering machinery, special car, the demand of the industries such as Heavy Type Steel Structure to specific function sheet material, this shows, the present invention has outstanding substantive distinguishing features and significant progressive, the beneficial effect of its enforcement is also apparent.
Description of drawings
Fig. 1 is the tissue of the high strength steel plate of acquisition.
Fig. 2 is the tissue of the low yield strength ratio steel plate of acquisition.
Fig. 3 is the tissue of the high-elongation steel plate of acquisition.
Embodiment
The present invention is described in further detail below by example:
First embodiment:
The steel billet that is C 0.08%, Si 0.15%, Mn 1.63%, Nb 0.031%, V 0.029%, Cr 0.26%, B 0.0018%, Alt 0.035%, Ti 0.022%, low-welding crack-sensitive indices P cm=0.19% with chemical composition is rolled into the 50mm thickness steel plate in 880-840 ℃ of scope, roll rear on-line cooling technology controlling and process as follows:
1) the steel plate cooling mode of producing high tough index request is, after controlled rolling, to enter the temperature of water-cooled be 790 ℃ to steel plate, once is cooled to 500 ℃ with the speed of cooling of 15 ℃/s, and then air cooling is to room temperature;
2) the steel plate cooling mode of producing the low yield strength ratio index request is, after controlled rolling, steel plate is treated coldly temperature in the rollgang overhead, enters fast water-cooling system when being chilled to 680 ℃, is cooled to 400 ℃ with the cooling rate of 25 ℃/s, and then air cooling is to room temperature;
3) the steel plate cooling mode of producing the high-elongation index request is, after controlled rolling, steel plate enters the water-cooled zone fast, and opening cold temperature is 860 ℃, and then direct quenching is cooling, and cooling termination temperature is 350 ℃, and tempering temperature is 530 ℃, tempering time 90min.
The mechanical property of the steel plate that obtains by above technique is as shown in table 1:
The mechanical property of the steel plate that first embodiment of table 1 the present invention obtains
Second embodiment:
The steel billet that is C 0.06%, Si 0.19%, Mn 1.55%, Nb 0.026%, V 0.027%, Cr 0.22%, B 0.0014%, Alt 0.028%, Ti 0.017%, low-welding crack-sensitive indices P cm=0.15% with chemical composition is rolled into the 14mm thickness steel plate in 900-840 ℃ of scope, roll rear on-line cooling technology controlling and process as follows:
1) temperature that after controlled rolling, steel plate enters water-cooled is 775 ℃, once is cooled to 540 ℃ with the speed of cooling of 18 ℃/s, and then air cooling is to room temperature;
2) after controlled rolling, steel plate is treated coldly temperature in the rollgang overhead, enters fast water-cooling system when being chilled to 660 ℃, is cooled to 450 ℃ with the cooling rate of 20 ℃/s, and then air cooling is to room temperature;
3) after controlled rolling, steel plate enters the water-cooled zone fast, and opening cold temperature is 855 ℃, and then direct quenching is cooling, and cooling termination temperature is 400 ℃, and tempering temperature is 580 ℃, tempering time 30min.
The mechanical property of the steel plate that obtains by above technique is as shown in table 2:
The mechanical property of the steel plate that second embodiment of table 2 the present invention obtains
The present invention is not limited in above-mentioned embodiment, and the variation that those of ordinary skills make in essential scope of the present invention, remodeling, interpolation or replacement also should belong to protection scope of the present invention.
Claims (1)
1. easy control method of cooling of welding quality plate, its chemical composition content per-cent by weight is C 0.05-0.09%, Si 0.1-0.25%, Mn 1.55-1.65%, Nb 0.025-0.035%, V 0.025-0.035%, Cr 0.20-0.30%, B 0.0008-0.0025%, Alt 0.020-0.045%, Ti 0.015-0.030%, all the other are iron and inevitable impurity, welding crack sensibility indices P cm value is less than 0.21% steel billet, the district is rolled into the steel plate that final thickness is 12-60mm at non-recrystallization, it is characterized in that: different according to the performance requriements of final steel plate, described steel plate is taked different on-line cooling patterns:
1) the steel plate cooling mode of applicable high tough index request is, the temperature of steel plate after controlled rolling being carried out water-cooled is controlled at 800-760 ℃, and once is cooled to 500-550 ℃ with the speed of cooling of 15-20 ℃/s, and then air cooling is to room temperature; What obtain is organized as granular bainite and a part of ferrite bainite, and plate property satisfies yield strength greater than 600MPa, and tensile strength is greater than 700MPa, and unit elongation is greater than 16%, and-40 ℃ of low-temperature impacts are greater than the high strength steel plate of the mechanical property requirements of 200J;
2) the steel plate cooling mode of applicable low yield strength ratio index request is, after controlled rolling, steel plate is treated coldly temperature in the rollgang overhead, and the water-cooling system that enters fast during to 700-650 ℃ to be cooled is cooled to 400-450 ℃ with the cooling rate of 18-28 ℃/s, and then air cooling is to room temperature; Polygonal ferrite+the granular bainite that is organized as 40-45% that obtains+a large amount of ferrite bainite, plate property satisfies yield tensile ratio less than 0.8, yield strength is greater than 530MPa, tensile strength is greater than 700MPa, unit elongation is greater than 16%, and-40 ℃ of low-temperature impacts are greater than the low yield strength ratio steel plate of the mechanical property requirements of 120J;
3) the steel plate cooling mode of applicable high-elongation index request is, after controlled rolling, steel plate enters the water-cooled zone fast, opens cold temperature and is controlled at greater than 850 ℃, then direct quenching is cooling, cooling termination temperature is 300-400 ℃, and tempering temperature is 520-600 ℃, tempering time 1.5-2min/mm+10min; What obtain is organized as tempering bainite, and plate property satisfies unit elongation greater than 20%, and yield strength is greater than 650MPa, and tensile strength is greater than 700MPa, and-40 ℃ of low-temperature impacts are greater than the high-elongation steel plate of the mechanical property requirements of 150J.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310083168.9A CN103114186B (en) | 2013-03-15 | 2013-03-15 | Control cooling method of easy-welding high-performance steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310083168.9A CN103114186B (en) | 2013-03-15 | 2013-03-15 | Control cooling method of easy-welding high-performance steel plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103114186A true CN103114186A (en) | 2013-05-22 |
| CN103114186B CN103114186B (en) | 2015-04-08 |
Family
ID=48412603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310083168.9A Expired - Fee Related CN103114186B (en) | 2013-03-15 | 2013-03-15 | Control cooling method of easy-welding high-performance steel plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103114186B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103231155A (en) * | 2013-06-06 | 2013-08-07 | 济钢集团有限公司 | Easy-welding high-strength large-thickness steel plate preheating-free gas shielded welding process |
| CN103725973A (en) * | 2013-12-26 | 2014-04-16 | 秦皇岛首秦金属材料有限公司 | 800MPa grade high-strength steel with low composition and low Pcm value and production method thereof |
| CN105200329A (en) * | 2015-09-11 | 2015-12-30 | 武汉钢铁(集团)公司 | Tensile strength-700MPa level easy-to-weld low-internal-stress structural steel plate and manufacturing method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10183239A (en) * | 1996-12-24 | 1998-07-14 | Nkk Corp | Production of quenched and tempered 600n/mm2 class high tensile strength steel excellent in weld cracking sensitivity and low temperature toughness |
| CN101849026A (en) * | 2009-01-15 | 2010-09-29 | 新日本制铁株式会社 | Steel for weld construction having excellent high-temperature strength and low-temperature toughness and process for producing the steel |
| CN101962733A (en) * | 2010-10-29 | 2011-02-02 | 北京科技大学 | Low-cost and high-toughness X80 pipe steel with high deformation resistance and manufacture method thereof |
| CN102191430A (en) * | 2010-03-19 | 2011-09-21 | 宝山钢铁股份有限公司 | Easy welding steel plate with yield strength of 550MPa and high toughness and manufacturing method thereof |
| CN102876997A (en) * | 2012-09-11 | 2013-01-16 | 舞阳钢铁有限责任公司 | Easy-welding tempering high-strength steel plate for ocean platform and production method thereof |
-
2013
- 2013-03-15 CN CN201310083168.9A patent/CN103114186B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10183239A (en) * | 1996-12-24 | 1998-07-14 | Nkk Corp | Production of quenched and tempered 600n/mm2 class high tensile strength steel excellent in weld cracking sensitivity and low temperature toughness |
| CN101849026A (en) * | 2009-01-15 | 2010-09-29 | 新日本制铁株式会社 | Steel for weld construction having excellent high-temperature strength and low-temperature toughness and process for producing the steel |
| CN102191430A (en) * | 2010-03-19 | 2011-09-21 | 宝山钢铁股份有限公司 | Easy welding steel plate with yield strength of 550MPa and high toughness and manufacturing method thereof |
| CN101962733A (en) * | 2010-10-29 | 2011-02-02 | 北京科技大学 | Low-cost and high-toughness X80 pipe steel with high deformation resistance and manufacture method thereof |
| CN102876997A (en) * | 2012-09-11 | 2013-01-16 | 舞阳钢铁有限责任公司 | Easy-welding tempering high-strength steel plate for ocean platform and production method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103231155A (en) * | 2013-06-06 | 2013-08-07 | 济钢集团有限公司 | Easy-welding high-strength large-thickness steel plate preheating-free gas shielded welding process |
| CN103725973A (en) * | 2013-12-26 | 2014-04-16 | 秦皇岛首秦金属材料有限公司 | 800MPa grade high-strength steel with low composition and low Pcm value and production method thereof |
| CN105200329A (en) * | 2015-09-11 | 2015-12-30 | 武汉钢铁(集团)公司 | Tensile strength-700MPa level easy-to-weld low-internal-stress structural steel plate and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103114186B (en) | 2015-04-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103255349B (en) | A kind of small dimension 600MPa level antidetonation Twisted Steel and manufacture method thereof | |
| CN102363859B (en) | Method for producing wear-resisting steel plate | |
| CN101613828B (en) | Super-thick steel plate for low yield ratio buildings with 460 MPa grade yield strength and manufacturing method | |
| CN104480406A (en) | Low-alloy high-strength high-toughness steel plate and manufacturing method thereof | |
| CN102286701A (en) | Thick plate for ultra-high-intensity boat body structure and production method thereof | |
| CN104264072B (en) | A kind of 600HB grade wear-resisting steel plate and preparation method thereof | |
| CN103866204B (en) | The large sstrain X80 dual phase sheet steel that the large soft reduction process of a kind of low temperature is produced | |
| CN106811698A (en) | A kind of high strength steel plate and its manufacture method based on tissue precise controlling | |
| CN104498821B (en) | Medium-manganese high-strength steel for automobiles and production method thereof | |
| CN102534417A (en) | High-performance bridge weathering steel containing Mo and preparation method thereof | |
| CN104278205B (en) | Low-carbon (LC) non-carbide bainitic steel and its manufacture method and its application in rail | |
| CN104911503A (en) | Extra-thick tempering EH40 steel for ocean engineering and preparation method thereof | |
| CN103451520A (en) | Q345 engineering steel and production method thereof | |
| CN102953000B (en) | A kind of ultrahigh-strength steel plates and manufacture method thereof | |
| CN104846277A (en) | Construction steel with yield strength more than or equal to 460 MPa and lamellar tearing resistant property and manufacturing method of construction steel | |
| CN103805865B (en) | A kind of economical X 70 petroleum natural gas pipeline steel and production method thereof | |
| CN105018856B (en) | The vertically and horizontally little structural steel for bridge plate of mechanical property difference and its manufacture method | |
| CN103014545A (en) | High-strength steel plate with 900 Mpa-level yield strength and preparation method of steel plate | |
| CN103276315B (en) | 900MPa-level ultrahigh-tenacity high-toughness pipeline steel plate and manufacturing method thereof | |
| CN103014520A (en) | F+P+B type low-yield-ratio and high-strength medium steel plate and production method thereof | |
| CN102925799A (en) | Production method of ultrahigh-strength steel plate | |
| CN105256117A (en) | Manufacturing method for high-strength ship TMCP steel superior in minus-80 DEG C low-temperature toughness for polar region | |
| CN102191430A (en) | Easy welding steel plate with yield strength of 550MPa and high toughness and manufacturing method thereof | |
| CN104818436B (en) | Surrender 620MPa level hydroelectric project hot rolled steel plate and production method thereof | |
| CN103114186B (en) | Control cooling method of easy-welding high-performance steel plate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150408 Termination date: 20190315 |